电磁场作用下铜板带水平连铸熔体的流动和凝固特征  

Flow and solidification characteristics of melt under electromagnetic stirring in horizontal continuous casting of copper thin-slab

作　　者：李伟轩[1] 于湛[1] 邓康[1] 雷作胜[1] 程镇康 任忠鸣[1] 

机构地区：[1]上海大学现代冶金与材料制备重点实验室,上海200072 [2]兴业电子铜带有限公司,慈溪315336

出　　处：《中国有色金属学报》2008年第6期1058-1063,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家高技术研究发展计划资助项目(2002AA3Z1410)

摘　　要：为了消除铜板带水平连铸中的微气孔、夹杂和柱状晶对接等凝固问题,提出一种基于正交磁场和直流电流相互作用的结晶器内水平电磁搅拌,并在实验室物理模拟实验的基础上,进行现场工业实验。在模拟实验中,用超声波多普勒测速仪测量该电磁搅拌下水平连铸结晶器内金属液的流动规律,并与生产实验中锌白铜板带的凝固特征相互印证,发现搅拌电流达到400 A时,板带内部气孔消失,电流达到500 A时板带出现等轴晶带,电流达到800 A时板带坯偏析率趋于零。A new horizontal electromagnetic stirring method in mold based on the orthogonal interaction between static magnetic field and DC current was put forward to overcome the solidification disadvantages such as micro pore, inclusion and columnar crystals joint in copper thin-slab＇s horizontal continuous casting. Commercial production was experimented based on the physical simulation in laboratory. In the simulation, the flow rule of melt metal in mold of horizontal continuous casting with electromagnetic stirring is measured using ultrasonic Doppler velometer, and the result is inter confirmed with the solidification characteristics is tics of zinc cupronickel thin slab in industrial product, some advantageous results are obtained that, when the current is 400 A the inner micro-pores disappear, when the current is 500 A the center equiaxed crystal layers occur and when the current is to 800 A the inner-segregation decreases to zero.

关 键 词：铜熔体 水平连铸 电磁搅拌 流动 凝固 

分 类 号：TG249.7[金属学及工艺—铸造] TG146.1[一般工业技术—材料科学与工程]